Pneumatic gate.



No. 871,391. PATENTED NOV. 19, 1907. W. P. ELLIOTT & W. P. ELLIOTT, JR.

PNEUMATIC GATE.

APPLICATION FILED JULYZS, 1907.

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UNITED sTATEs PATENT oEEIoE.

tower in a position that will afford to the operator the necessarycommanding view of the i enablewthe gates to be operated from one of behad.

"gate-post; and to this end our invention con- 11 leading to theatmosphere.

, 13 ona rod 14, communicates from its upper .end controllably throughthe valve-device 10 withfthe pipes 8 and 9, through a supplant the meansfor the same purpose parts hereinafter described and shown in theaccompanying drawing,

insectional elevation, a pneumatic gate con- I sisting of a singleswinging arm on a gate-post containing the a crankearm 3 on its fulcrum,through the anair-cylinder 7 stably supported in the r check-valvedevice 17.

VILLIAM: P. ELLIOTT AND WILLIAM P. ELLIOTT, JR., OF LA GRANGE, ILLINOIS.

PNEUMATIC GATE.

T o allwhom it may concern:

Be it known that we, WILLIAM P. EL- LIOTT and WILLIAM P. ELLIOTT, Jr.,citizens of the United States, residing at La Grange,

Itis the more usual practice to operate the, pneumatic gates at arailway crossing from a tower containing the operating pump and thevalve mechanism for directing the airp'r'essure to lower and raise theswinging gatearm; but it is not always possible, at the installation ofa crossing-gate to locate the crossing," so that it becomes necessary tothe poststo enable such commanding view to The. object of our inventionis to provide novel and simple means, to supplement or provided in theoperating tower, for pneumatically operating the gate or gates at asists in the construction and combinations of The drawing illustrates,by a broken view neumatic arm-actuating mechanism inclining an air-pumpwith our improvedmeans for working it.

The post 1, which may be of any usual or suitable form of construction,has ournaled upon it,-inthe ordinary manner, a counterbalanced gate-arm2, having connected with medium of a link 4, the rod 5 of a piston 6 inpost. Air-pipes 8 and 9 lead, respectively, Into opposite ends of thecylinder 7' from a valve-device 10, of the four-way variety, in or onthepost, and having an exhaust port An air-pump, consisting of a cylinder12 vertically supported in or on the post and containing a piston ipe 15equipped ,Wlth an air-inlet check-valve device 16 and containing abovesaid device, a A pump-operating Specification of Letters Patent.

Application filed July 26, 1907- Serial No. 385,676-

Patented. Nov. 19, 1907.

lever 18 is fulcrumed on the post 1 near the base thereof at 19, thefulcrum pin carrying a crank arm 20 connected at its free end with thelower end of the piston-rod 14 through the medium of a link 21.

To operate the gate, the handle 18 is turned, back and forth, from oneside to the other of the post, to work the pump 12, each downstroke ofthe piston 13, through its connection with the operating lever, suckingatmospheric air through the valve 16 into the pump-cylinder and eachrip-stroke of that piston forcing the air through the pipe 15 into thecylinder 7 against one side or the other of the piston therein,depending on the condition of the valve 10 to which it is brought by ahandle 22 provided for operating it. The gate-arm 2 is lowered from theraised position in which it is illustrated, with the valve-device 10 inthe condition represented in the drawing, by working the pump 12 tocompress air through the pipe 15, past the valve 10 and through the pipe8, against the under side of the piston 6; and the air ahead of thatpiston will exhaust through the pipe 9 and valve-port 11 into theatmosphere. Preparatory-to raising the gate-arm, the valve 10 is turnedto connect through it the pipe 9 with the pipe 1.5, where by the pipe 8communicates with the exhaust-port 11, whereupon by working theair-pump, the actuating air is compressed against the upper side of thepiston 6 and the air ahead of it in the cylinder 7 is exhausted throughthe pipe 8 to the atmosphere by way of the port 11.

As will be understood, while our invention is illustrated, for the sakeof simplicity, in connection with a single gate-post and arm, it is thesame in construction and operation where additional posts are provided,as is more usually the case at a crossing, each carrying a swinginggate-arm to be actuated by the air-pressure generated in the pump 12.

What we claim as new, and desire to secure by Letters Patent, is

1. In a pneumatic gate, the combination of a post carrying a swinginggate-arm, an air-cylinder containing a piston having its red connectedwith said arm for swinging it, air-pipes leading into said cylinder atopposite sides of the piston, an air-pump on the post containing apiston on a piston-rod, a pump-operating lever fulcrumed on the post andprovided with a crank-arm extending from its fulcrum, said crank-armhaving a link-connection with the piston-rod of the pump, a pipe leadingfrom the discharge-end of the pump-cylinder and containing an intakecheck-valve and a second check-valve, and a valve-device for controllingcommunication with said pipe of said air-pipes and of said air-pipeswith the atmosphere. 1

.2. In a pneumatic gate, the combination of a post carrying a swinginggate-arm, an air-cylinder on the post containing a piston having acrank-arm connection between its red and said gate-arm for swinging it,airpipes leading into said cylinder at opposite sides of the piston, anair-pump comprising a cylinder supported on the post and conpost andprovided with a crank-arm extending from its fulcrum, said crank-armhaving a link-connection with the piston-rod of the pump, a pipe leadingfrom the discharge-end of the pump-cylinder and containing an 1ntakecheck-valve and a second check-valve,

and a valve-device having an exhaust-port and interposed between thepump-discharge pipe-and said air-pipes.

- WILLIAM P. ELLIOTT.

WILLIAM P. ELLIOTT, JR. In presence of RALPH SOHAEFER, W. T. J ONES.

